Make the tests run on Cray supercomputers - see issue #154
I've modified the Tester driver program to be configured by CMake. The MPIEXEC program and its flag to specify the number of processes is now given through CMake and a NEKTAR_TEST_FORCEMPIEXEC option added. If the compiler has MPI_BUILTIN (as on Cray machines), then the minimum necessary options that would have been set by FindMPI.cmake are set.
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